Revert "Our debug flags now overlap (debug-gc and debug-gc-stats). We can't just accept prefixes anymore."
Revert "Our debug flags now overlap (debug-gc and debug-gc-stats). We can't just accept prefixes anymore."

This reverts commit d54335652a423bebe1c1e3b040abe3882a5f9e43.

rrnewton/accelerate,sjfloat/accelerate